I was on prednisone for only five days because I had bronchitis. Although I workout regularly I allowed myself to rest for a week because I probably got sick from running myself into the ground. I don't feel like I was overeating but now just a few days after stopping taking prednisone I blew up over night. My underwear don't even fit! Could this just be a lot of water retention or is it possible that I packed on that much weight in such a short amount of time?? I went back to the gym and training on Monday so I would think that I'd sweat out most of the water but perhaps I'm wrong.